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Reports any <code>java.util.concurrent.ScheduledThreadPoolExecutor</code> instances in which
<code>corePoolSize</code> is set to zero via the <code>setCorePoolSize</code> method or
the object constructor.
<p>
  A <code>ScheduledThreadPoolExecutor</code> with zero core threads will run nothing.
</p>
<p><b>Example:</b></p>
<pre><code>
  void foo(int corePoolSize) {
      if (corePoolSize != 0) return;
      ThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(corePoolSize); // warning
      executor.setCorePoolSize(corePoolSize); // warning
  }
</code></pre>
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